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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37e5b4c55d06b2398baadeb499f0fb4a0aca4e4848cdfb0a0732423ef6838994' 
  AND token = 'KPFsxrGjA18Hx3cgezS86gdhAVx74LQuSNvcJrOY9pI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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