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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1fa91fc6e4698f11552187e1c26c7452af6db7caebfea287e4e791bf1f3e725' 
  AND token = 'IT8H51Q9BH0P/NyGgRUT3Cc+mYH4Vd7GlHmb2GFVenc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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