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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b15f71fb2b049f9440cbbd26e13b19f22de3240ef583ef68ceda55140fb9c1' 
  AND token = '/Ph5Rc/Bt/sscJD/I3svWhAEjVLYxRNADxvj5R0qy4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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