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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f33f18e06cc68f5f914586eb8904571a0c0e92460a6d6565acd2f795460a3f' 
  AND token = 'zU/BHsPCMyqkO0ryd+2FV+yY0XZ8cgUeseErT4gQ3wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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