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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df649955e69bf53f32aa14ff47b921f53709adfe0a6c56233c8d02797244259d' 
  AND token = 'B4RAQvfgDP/rLdCg/3KkSaSDd0ry4QSCSLa6jwBn1kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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