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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a94fd435d437323850fb28916c0e04b7b3a6e3426f2c9010c320d88f26deb3c5' 
  AND token = 'o+Bq6SUvg783czp83SHi4OOUR9h+zcCw1YKu7h+0M+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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