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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ec5cdde7ae75baec5435359d86435db3305175e9db4d73d4b206c4cf09eb01f' 
  AND token = '3HHYVG1lG+GbFGGKSCTNh8W69btfVnAaiWMGCny5Qzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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