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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52c63a5622d1d62c34ab0033af59dbcc2893aed232bc0ce2c33078e1158789b6' 
  AND token = 'GqE8+SEsgRoiyO0b24IxSjD4v6sOsSPABg+cgnFBZ7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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