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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8f53b2a28fcd77f42004d9fa393ca090fc4c13f6891c5a3f818715f23a2f4ac' 
  AND token = 'uXrQ388r8o38c/MmV+fFfCjZ+EfPfE4sq8o02qKgjSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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