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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdde10b1381c5acb2096d940b4d0c9fcf64e8c4bb8b6a0e47728f4f9234aaf26' 
  AND token = '1eOymEgXzptdN3IWxsiokzV+ax4Hpc05/KMN8sPQiPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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