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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2df7a62f4776f1c0117ef8c209b6290710602282a4ba4760dcd0e13c063b791' 
  AND token = 'DzoNQFqsKdPIcro4owiJQgwpOP9q+6+2CdNVa2sSVGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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