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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66c5c1a43215015e9f936a04d00df3fe350f9ba867b6a194a7dc775ac173ecb0' 
  AND token = 'W02D+rL4yph3rhwYpU0owD1rsa7PMxxCHKGkzUQt+/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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