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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '440fc54ca6ec09fadcb97292d0914f537e62d5f1b17248e125d7fdc15f367837' 
  AND token = '5tvMcKsOLDX71uL7qABSoDIspC7QIGNYwMU4RfEp96o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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