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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b4fff5484c3ab654b9295b02a3e8536c8cc7dfa861e6f787dfd808630d9568c' 
  AND token = 'q1+FC3Qgy61HutHKDavBC74rhYdDNsP21c3NeU1b1U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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