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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd0fd2e8e4ac40cf7df1cdf1caf6b74049e53c985b73e06b4b802af621057b6' 
  AND token = 'b92hg47crkGcfbD5I9DZKdYxw6X1PlB1u6iW/Uc8VQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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