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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ed1053f52db0c42bb60b3260faeb2dd7349192384ff919e15d6eca3a1d9ffe2' 
  AND token = 'mIowvzUtsjwgP/SebHT0d12u/CigQbnc+L7aww/RAG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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