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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '088e5a98b58b9df2384b7f4bdcb16e2dd007246db6fd2fd0dc59d65efbec88ce' 
  AND token = 'KSWa9fj/ElB3mI5M5VumSVR603P/U/pmVzmxPZrEoN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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