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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e0baf9a2f46ca447a9c1ed5b34465a867d268d17dd7cc9b846185a3b7c1114' 
  AND token = '5JjeZ5L/emP6Pmx64ykzXvdhaHR6iCg7OZVEs6lWPSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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