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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a153b10f760d6bb87992be04338a181c25e31bf9b195ddc5a8c4a258a36ece4a' 
  AND token = 'hnhnPs8YMN+mjveCDIKzbRILCBeUNkqbazCuJ9Zbvd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}