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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d1e80b19c9b1a8a80e1ee12d124e47e6d5ce6f21c990a410150a41947048a8' 
  AND token = 's/etySBX9K4odoHyrM/X0i0IrOffB12kyluTfQ9MEnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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