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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b81be912d4dd0f3484ebc8d84b96e0bf8e411e77f4e685b252125ab90ab34d67' 
  AND token = 'Nnkzx+ClhrDC83068gJuvgTqffavklfCPTd3t7aRGfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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