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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4115171f99eb18ac38c3651f05aa2036ed03b075b7f54b87035bf12efc634664' 
  AND token = 'Xly30iJJWnKap/5Y+7tVs1Qfgh0K7RgT/q+2idMLHQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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