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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97012e17a2c992156917c7449882fa96dc0a29914b0df27cc5e88fd8e2fca2a7' 
  AND token = 'bZ3ZQxykwz+0Q0Qe6G750x7n9zBwErX0WRbHbuHjjS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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