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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '953440502112dc579510d47a195bdd7d366ad047fab30d0c03a2542a58ef4b26' 
  AND token = 't7Qayf/cbBORcj/RvKoxBw5Nkqh+jpEWzrqtvD7dX1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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