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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6fa0823088c6e2a87c5c7d87be3afd0ca53895212da546498af2b8100279be4' 
  AND token = 'U2cPrQnhZEFWuvrw9QHif91rKnXAurHNzmGaSl7vxZM=' 
  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"
    }
  }
}