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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5a23fa709172e08817bc4c69a41c34fe37884fe00fa2bd1a6bc3e5020989ceb' 
  AND token = 'eWaYODw6aqWYbs+wy0x4Z49C3pG9sdB31m8UNsMPM/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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