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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ded4198a3ead42ceff24e560740d25910e7ce5b27916b5afe751e9c8d0f392d' 
  AND token = 'bUaTpHTra6Bpj3FebY8B+BAoXNbmLF4oYhM4HNsim9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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