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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a4d1118e8f332fe1d87ecc49365a1ca7f7be92cc55a4f75a6c0ca88bcdc61e6' 
  AND token = 'gHAsd3VoOkOZmm5m/0ehWAaBHXiwGsM7a5SZD6FDkUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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