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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b15a4aaca22339a0ac5c82f88a114c43a2d704d96a6fd6329d5214c712f6eb' 
  AND token = 'p7elT89G9ue0PMVijStnpJ7dB9TsWOeaPg/XD0m936Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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