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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e0b112a693bb0dc5129a0e830095e740f86a3a97ba5781b18d1e369752d180' 
  AND token = 'ThSGI1LxzEb0Dlby7NLRa0K+h8/iX1aR911geqkRL0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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