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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a162b0c31114b30e28dbaf4174810ba33153d0fd66cc0f7278aca7f0b2378a6' 
  AND token = 'zswGnkH4hoWrDPz3Q+FYBdbO/KmMfxT44+n/izAWDL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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