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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccbd88b3a1d5291c06595ce8b5e538719d4fd607b9f208e883bed5e7165cc35d' 
  AND token = 'L8cie2TVBTcv61qQvpVNREqNqhazgZXyjqxSCV0YH+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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