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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e63b3babcf0faf548fce35141d053c158fdc4e91a8adac7ede39ff80c29032cf' 
  AND token = '53bhg3E1ORvlnqQShO0I/HiVOl4BNixaYoxt1DxROp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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