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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e62107754f6fe7048ecbd037c76b7e8927655ca667e1a6152da04745c3ec23' 
  AND token = 'zp/JVWpN98YxeuFxQhDCPut4EysgF+3JZXURyG4lkrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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