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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfe7662e8b746d937f191909f4669f66ca0bf9af043e4eeffde984502c65b09c' 
  AND token = '5P7xfFmaprHlo3LPEwplbt62foCziviZ+62rQszUFBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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