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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a6f6bf3c259cdae1ba72669265a770d6e5d17c67b2ed085446ee2a5de28d11e' 
  AND token = '5usYs0Nr7ua4KO6YSsZvZUeVYmXac5v1rjYZlNDRvMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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