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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73775663b0be9f8b721a0c0e0997f4b3c9b2d591ef8de946c3292ac4bab2f86a' 
  AND token = 'Mzb6piXmmr5U5vmlVZ54ZGcJckaF6VM/Qhb1YBdBE7o=' 
  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"
    }
  }
}