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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c8ef5a5426a9ec0cc0086d727ab13e8c245a96c8b8f78fec2bbbf2a0ccf485b' 
  AND token = '2JUb2N0GRMFDujpuJHnkh7q5YTwvqaq7+KKPPmNDU5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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