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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7215ea0a5c73e7d612a81706ca73fe470efcd161d429c39d4ade313470be8a33' 
  AND token = 'MNlLQq0ArE4J06T3BoDafTn22sgIMbteLMcgC1lnf80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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