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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b34726e1b73c956b88a689de6d6c9d9b06ffc2f90a5f7e76988c866cb626907b' 
  AND token = '6HPpraGxECmIe16UfYvHSR+nMQIRUnC2x6I6aEYoPzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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