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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b00f6b59ae1d5a23c57aac975627549552d26647e3f5a66c149f579196114de3' 
  AND token = '0EgKyks/L4BPoReA3Q97x5MlO2pLtDbKyWhjRIspFhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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