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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecfaa94f07522746933cbd60bda59b7d606f611d8ca118d186da6e2db6cda71b' 
  AND token = 'sv6phX8aSeF4VOx3WaCEih7nMzTpoCU5A8qsJOt2aXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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