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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f8380b595f4c55a8c5d027b1ff0c473e69c008c9f994c42c5e426d2dfcb60fd' 
  AND token = 'X7XeMA7/55gEbV0n5fpXnwLOVfWm/qgfuE72kAQb7gk=' 
  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"
    }
  }
}