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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '119f2c9df7a43e2591031a40281ea8bf21a11b3056f3d7e31dba322b62df0c48' 
  AND token = 'J7cepr1HDcEdwn+OiqrkOZtg+6MyHi0GrmDCFu+loN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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