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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f90c789a9b4c18a288606369f2ee848203d4343c4d43b0fe4a7c08ceb79a41bd' 
  AND token = '8NxgtQ8z/tWcKqf4cc+yk6PCk26oOVDtY2YU/KfPSo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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