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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '809eaa2ab79853571d93e32910c359a10e5ed4b358f8af3d901ebcdb5e1c9177' 
  AND token = 'KCqLGQUSbAN2n2stDIEkzlyfdro1gKMdx/OXqEO2ClM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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