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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd28871c16ebd2ffc0796215cd9575adae03a5c12cadf00c9ac60ddb36b89726a' 
  AND token = 'tuno0eeApy/0z4MgczhN/gNYjv4M10VcBiaaaRjUgsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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