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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2335973adc5bdc67fb691e0071121179a1db5f0db44fefbfcbae989f40328678' 
  AND token = 'PYfkee/NIcii6VM/WUYLdh6XsxtlZD3rnU0FG4v0FnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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