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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccdc200b9903320fb44863e58477ea7c5ea55acd2c10296a22344b6e28f90108' 
  AND token = '0u8O5Gc2dhcoLcq5aKJ6eV06jjuC+TSHRLYIcLUy0EA=' 
  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"
    }
  }
}