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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '661f0cbabe48cfeebd9eacb3b07e308809f5f762884e9308c79ab657b978ce66' 
  AND token = 'AhUFu8gmXnEg1SbNCO5Ii686y9B3SfKdWVxf5x0dhC0=' 
  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"
    }
  }
}