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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67111479db4a19116de009b33689e7f4d1f28c1a63d0838d691374d01f246880' 
  AND token = 'bcOOYQn252FUkZdl8nfLQKlQ76FVMpGyJtQua1au1s4=' 
  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"
    }
  }
}