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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21430128ef9bc8ecc4c8a7f5e47b2b7e27e20e93a031e3aa8f0fa9e7629b7c60' 
  AND token = 'YLENE3q6teWwG/XcD4TyXd8FJI75EEe7JXm9N6hoWbY=' 
  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"
    }
  }
}