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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4221eafb06a37ee90a0bfb0ddd90308c09623ab33979bb6e2b1f3a1b5f6db6c8' 
  AND token = 'aUHYI5vD2GvT7v+V2Q5Xd469/kghNFlyPUurUXc375Y=' 
  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"
    }
  }
}