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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f442efeef0b3be19a98e5a3c5b1e285b81b8695886b56ef9ba723885cb08b02' 
  AND token = 'kx8SAwbCQ3jJ2UCp5w9tvzL3brLUBt+dehleDZdpIeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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