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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da1952b2e4adb13ba40166375522f6ab5a4c0302e6c77c4c3bba2cbd545f19fa' 
  AND token = 's4Soj+9W9YE3EzYcCTgQFZmCF3n0MOVbHu72qWmKaZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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