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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c99bcdb2e193e264a8a193eddec03265b8c29a765fd566cc87e370a0d393f44' 
  AND token = '6s/WQOp6q14lO1b2/y5iyXZPOuBCONkYjRRF8vsQl3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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