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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c696b4fb8115182189e5377df9a0253e5531677d4331f3c9f457cb429e8f9e6' 
  AND token = 'K5D1SVObVvp/Eezckspb3+uux/Tw1MY4VL6i9nqzAcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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